package com.atguigu.flink0624.chapter07.state;

import com.atguigu.flink0624.bean.WaterSensor;
import org.apache.flink.api.common.eventtime.WatermarkStrategy;
import org.apache.flink.api.common.state.ValueState;
import org.apache.flink.api.common.state.ValueStateDescriptor;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.streaming.api.functions.KeyedProcessFunction;
import org.apache.flink.util.Collector;

import java.time.Duration;

/**
 * @Author lizhenchao@atguigu.cn
 * @Date 2021/11/15 15:25
 */
public class Flink05_KeyedState_List {
    
    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        conf.setInteger("rest.port", 2000);
        StreamExecutionEnvironment env = StreamExecutionEnvironment.getExecutionEnvironment(conf);
        env.setParallelism(1);
    
        // 返回值就是每条数据的事件时间
        env
            .socketTextStream("hadoop162", 9999)
            .map(line -> {
                String[] data = line.split(",");
                return new WaterSensor(data[0], Long.valueOf(data[1]), Integer.valueOf(data[2]));
            })
            .assignTimestampsAndWatermarks(
                WatermarkStrategy
                    .<WaterSensor>forBoundedOutOfOrderness(Duration.ofSeconds(3))
                    .withTimestampAssigner((element, ts) -> element.getTs())
            )
            .keyBy(WaterSensor::getId)
            .process(new KeyedProcessFunction<String, WaterSensor, String>() {
    
                private ValueState<Integer> lastVcState;
    
                @Override
                public void open(Configuration parameters) throws Exception {
                    lastVcState = getRuntimeContext().getState(new ValueStateDescriptor<Integer>("lastVcState", Integer.class));
                }
    
                @Override
                public void processElement(WaterSensor value,
                                           Context ctx,
                                           Collector<String> out) throws Exception {
    
                    Integer lastVc = lastVcState.value();
                    if (lastVc != null) {
                        // 判断这次和上次是否都大于10
                        Integer currentVc = value.getVc();
                        if (lastVc > 10 && currentVc > 10) {
                            out.collect(ctx.getCurrentKey() + " 连续两次水位超过10, 红色预警....");
                            
                        }
                    }
                    
                    lastVcState.update(value.getVc());
    
                }
            })
            .print();
    
        env.execute();
        
    }
}
